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首页> 外文期刊>Journal of Biomechanics >Improved RSA accuracy with DLT and balanced calibration marker distributions with an assessment of initial-calibration.
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Improved RSA accuracy with DLT and balanced calibration marker distributions with an assessment of initial-calibration.

机译：借助DLT和平衡的校准标记分布（通过评估初始校准）提高了RSA准确性。

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摘要

Roentgen stereophotogrammetric analysis (RSA) has been used for over 25 years for accurate micromotion measurement in a wide variety of orthopaedic applications. This study investigated two possible improvements to the method. First, direct linear transformation (DLT) was compared to the traditional RSA reconstruction algorithm. The two methods were considered with respect to standard extrapolation and interpolation calibration cages. Matlab simulations showed that reconstruction accuracy was greatly improved (>60%) by combining DLT with an even distribution of enclosing calibration markers. Second, a benchtop study using phantoms translated at 0.0254-mm intervals showed initial-calibration, followed by removal of the interpolation cage for subsequent exposures, was potentially twice as accurate as self-calibration with an extrapolation cage. These results showed optimizations for the application of RSA when unobstructed space is required.
机译：伦琴立体摄影测量分析（RSA）在各种骨科应用中已经用于准确的微动测量已超过25年。这项研究调查了该方法的两种可能的改进。首先，将直接线性变换（DLT）与传统的RSA重建算法进行了比较。关于标准外推和内插校准笼，考虑了这两种方法。 Matlab仿真表明，通过结合DLT和均匀分布的封闭校准标记，可以大大提高重建精度（> 60％）。其次，使用以0.0254-mm间隔平移的幻像进行的台式研究表明，进行初始校准，然后移除内插笼进行后续曝光，其精度可能是使用外推笼进行自校准的精度的两倍。这些结果表明，当需要无障碍空间时，RSA的应用程序进行了优化。

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